NDLI: Quantifying spatial correlations in extinction risk for an aphid metapopulation

Content Provider	Springer Nature Link
Author	Hudgens, Brian R.
Copyright Year	2006
Abstract	Metapopulation persistence depends on dispersal offsetting local extinction risks. The mitigating power of dispersal to offset local extinction risks is substantially reduced if extinction risks are highly spatially correlated. Extinction risks are likely to be spatially correlated when mechanisms driving local extinction act on large spatial scales, such as climatic events or far-ranging predators. In this paper I develop a method to quantify spatial correlations in local extinction risks within a region. I then show that colonies of the aphid Aphis lugentis within clusters of their host plant, Senecio bigelovii, do not have strong spatial correlations in extinction risks, even though the primary mechanism for colony extinction is over-predation by far-ranging predators (ladybugs and syrphid flies). Consequently, dispersal potentially plays an important role offsetting local extinction. Aphids did experience a weak, but significantly positive correlation in extinction risk in one of the two years of this study as well as increasing extinction risks across all plant clusters in both years. These observations point to important gaps in our understanding of how population synchrony affects metapopulation persistence.
Starting Page	63
Ending Page	73
Page Count	11
File Format	PDF
ISSN	14383896
Journal	Population Ecology
Volume Number	49
Issue Number	1
e-ISSN	1438390X
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-10-24
Publisher Place	Tokyo
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Aphis lugentis Population persistence Predator spillover Forestry Behavioural Sciences Evolutionary Biology Plant Sciences Zoology Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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